SHFiguarts usually run anywhere from $50-75 dollars if that's any indication, as it should be since it's the same line.
As for the Keyblade... I speculate a $300 price tag, depending on the material used (Proplica has released some Sailor Moon replica stuff before; for instance, the moon wand was priced at around $180 iirc and it's like a third of the size). If this doesn't come stateside, we're looking at import costs, and EMS prices went up within the past year. For reference, I imported some car parts from Japan that probably have a similar size and weight as that Keyblade and the shipping alone was $300.
So... I guess, we'd better start saving now!